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  • 1
    Electronic Resource
    Electronic Resource
    Electrolytic process optimization by simultaneous-modular flowsheeting (1994)
    Springer
    Journal of applied electrochemistry 24 (1994), S. 1206-1212 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A procedure is described for computer-assisted optimization of an electrolytic process flowsheet. Material, energy, and economic balances for all process units were incorporated in a nonlinear optimization routine for predicting the minimum selling price based on a discounted cash flow rate of return on investment. The optimization utilized a simultaneous-modular approach which was incorporated into the public version of the Aspen flowsheeting package, and used an infeasible path convergence method based on successive quadratic programming procedures. Electrolyte vapour-liquid equilibrium data were estimated by the ‘non-random two-liquid’ model. The Lagrangian multipliers of the constraint equations were used to determine the sensitivity of the optimum to key process variables. The method was illustrated by evaluation of two process flowsheets for electrosynthesis of methyl ethyl ketone (MEK) from 1-butene based on pilot-plant performance reported in the patent literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00249883
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A simultaneous-modular approach to process flowsheeting and optimization. Part II: Performance on simulation problems (1985)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 31 (1985), S. 1857-1867 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The performance of the simultaneous-modular approach on five simulation problems, ranging in complexity from very simple to moderately complex, is studied. Numerical experiments comparing different computational strategies for implementing the simultaneous-modular approach are also performed. Full-block perturbation is found to be the most suitable technique for obtaining the flowsheet-level Jacobian. On process simulation problems the simultaneous-modular approach, as implemented in SIMMOD, is found to be as reliable as the sequential-modular approach, and competitive with or sometimes much better than the sequential-modular approach in terms of computational efficiency.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690311111
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A simultaneous-modular approach to process flowsheeting and optimization. Part III: Performance on optimization problems (1985)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 31 (1985), S. 1868-1881 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The performance of the simultaneous-modular approach on four process optimization problems is studied, and numerical experiments using different computational strategies are also performed. The simultaneous-modular approach is found to be very effective on process optimization problems, and the strategies used in our implementation SIMMOD are found to be more efficient than those used in previous implementations of the simultaneous-modular approach for process optimization.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690311112
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A simultaneous-modular approach to process flowsheeting and optimization. Part I: Theory and implementation (1985)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 31 (1985), S. 1843-1856 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: There basic problem formulations for the simultaneous-modular approach are discussed, as are three alternative methods for computing the flowsheet-level Jacobian. A new algorithm for partitioning and tearing when using the simultaneous-modular approach is also presented. SIMMOD, our implementation of the simultaneous-modular approach is then outlined. In subsequent papers in this series we use SIMMOD to study the performance of the simultaneous-modular approach on process simulation and optimization problems, as well as to perform experiments on different numerical strategies for implementing the simultaneous-modular approach.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690311110
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  • 5
    Electronic Resource
    Electronic Resource
    Parallel frontal solver for large-scale process simulation and optimization (1997)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 43 (1997), S. 1032-1040 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: For the simulation and optimization of large-scale chemical processes, the overall computing time is often dominated by the time needed to solve a large sparse system of linear equations. A new parallel frontal solver that can significantly reduce the wallclock time required to solve these linear equation systems using parallel/vector supercomputers is presented. The algorithm exploits both multiprocessing and vector processing by using a multilevel approach in which frontal elimination is used for the partial factorization of each front. Results of several large-scale process simulation and optimization problems are presented.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690430417
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    Paper (German National Licenses)
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